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  1. #1

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    Default I need power supply help

    I have a diy old power supply kit i found and assembled for fun 0 -24 volts but low amps, or possibly MA, i want to use it for my sonic impact but it starts the amp clipping and light blinking and runs out of steam... I had a volt meter hooked up and the voltage holds so im sure its the amperage... how can i improve amperage on a circuit? It has a transformer, small board that i instaled a few caps, diodes? and a power? thing, lol.. with a heat sink on it... what ever that is.. so what would help increase the amps? Its small and i want to do point to point wireing to get rid of the board and stuff it in a small case to match my DIY SI amp... any help is appreciated..
    MY HT RIG:
    Sherwood p-965
    Sherwood sd871 dvd
    Rotel 1075 amp x5
    LSI15 mains
    LsiC center
    LSIfx surround backs
    Lsi7 side surrounds
    SVS pb12/plus2


    2 Channel Rig:

    nad 1020 Pre-amp
    Rotel 1080 stereo amp
    Polk sda 2B
    kenwood grunt Tuner
    realistic lab 450 TT
    Signal cable IC

  2. #2

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    Default

    The best bet is to buy a 13.8V transformer, run it through a full wave diode bridge to turn into DC then use filter capacitors. IF you need AC power.

    But, why not buy a lead acid gell cell battery and a wall wart power adaptor to charge it with. The battery will give you clean high current power and should only have to be charged once in a while.

    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D

  3. #3

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    Default

    well just because i had this already, it has a transformer and all the parts I think you mentioned.. But what is the part that would increase amps? I mean im useing a nice stand alone PS now but its just to big.... and i thought about the wall wort.. but was trying to be creative and at the same time use parts that i had if i only needed to add a part or so... like bigger capacitor? or something
    MY HT RIG:
    Sherwood p-965
    Sherwood sd871 dvd
    Rotel 1075 amp x5
    LSI15 mains
    LsiC center
    LSIfx surround backs
    Lsi7 side surrounds
    SVS pb12/plus2


    2 Channel Rig:

    nad 1020 Pre-amp
    Rotel 1080 stereo amp
    Polk sda 2B
    kenwood grunt Tuner
    realistic lab 450 TT
    Signal cable IC

  4. #4

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    Default

    ok, you probably have a transformer w/ 2 leads coming off of it, going to the diodes, then a bigger capacitor, then a 3 pin chip (power supply regulator probably 78xx) w/ the heat sink then a smaller cap... The problem is that the power supply chip probably has a max current of about 1amp and you need more like 2a...

    So bottom line is that it's worth the money to just buy a higher rated wallwart.
    Gallo Ref 3.1 : Bryston 4b SST : Musical fidelity CD Pre : VPI HW-19
    Gallo Ref AV, Frankengallo Ref 3, LC60i : Bryston 9b SST : Meridian 565
    Jordan JX92s : MF X-T100 : Xray v8
    Backburner:Krell KAV-300i

  5. #5

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    I cant just buy a larger power supply chip from RS:? if not screw it i'll get the wall wort and call it a day...
    MY HT RIG:
    Sherwood p-965
    Sherwood sd871 dvd
    Rotel 1075 amp x5
    LSI15 mains
    LsiC center
    LSIfx surround backs
    Lsi7 side surrounds
    SVS pb12/plus2


    2 Channel Rig:

    nad 1020 Pre-amp
    Rotel 1080 stereo amp
    Polk sda 2B
    kenwood grunt Tuner
    realistic lab 450 TT
    Signal cable IC

  6. #6

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    Default

    If you want a project:
    http://www.mitedu.freeserve.co.uk/Ci...er/1230psu.htm

    basically, your power supply is going to be similiar to the bottom half of that picture, you'd have to build the top half... but 30amps should do the trick :)
    Gallo Ref 3.1 : Bryston 4b SST : Musical fidelity CD Pre : VPI HW-19
    Gallo Ref AV, Frankengallo Ref 3, LC60i : Bryston 9b SST : Meridian 565
    Jordan JX92s : MF X-T100 : Xray v8
    Backburner:Krell KAV-300i

  7. #7

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    Default

    Thats alittle beyond my knowledge, The output chip is a PQ 8206 motorola, Its not the 3 legged type.. its the silver disk looking thing with a bolt on each side of the pill like center and 2 solid wires coming out the bottom into the pcb
    Last edited by faster100; 05-02-2005 at 03:23 PM.
    MY HT RIG:
    Sherwood p-965
    Sherwood sd871 dvd
    Rotel 1075 amp x5
    LSI15 mains
    LsiC center
    LSIfx surround backs
    Lsi7 side surrounds
    SVS pb12/plus2


    2 Channel Rig:

    nad 1020 Pre-amp
    Rotel 1080 stereo amp
    Polk sda 2B
    kenwood grunt Tuner
    realistic lab 450 TT
    Signal cable IC

  8. #8

    Member Sales Rating: (4)

    Join Date
    Feb 2005
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    Default

    check out here:
    http://www.discovercircuits.com/P/pwr-variable.htm

    I think there is a chip that does higher current, but your diodes & transformer would have to be rated, too...

    I'd just buy a better wallwart
    Gallo Ref 3.1 : Bryston 4b SST : Musical fidelity CD Pre : VPI HW-19
    Gallo Ref AV, Frankengallo Ref 3, LC60i : Bryston 9b SST : Meridian 565
    Jordan JX92s : MF X-T100 : Xray v8
    Backburner:Krell KAV-300i

  9. #9

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    Sep 2001
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    Default

    why does my stupid volt meter keep blowing fuses? geez... its a radio shack and its new, anyways... thanks for the help i'll start looking for wall warts ...
    MY HT RIG:
    Sherwood p-965
    Sherwood sd871 dvd
    Rotel 1075 amp x5
    LSI15 mains
    LsiC center
    LSIfx surround backs
    Lsi7 side surrounds
    SVS pb12/plus2


    2 Channel Rig:

    nad 1020 Pre-amp
    Rotel 1080 stereo amp
    Polk sda 2B
    kenwood grunt Tuner
    realistic lab 450 TT
    Signal cable IC

  10. #10

    Member Sales Rating: (17)

    Join Date
    Jul 2001
    Location
    Northern Colorado
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    The true beauty of the t-amp is that it doesn't have all the AC line garbage. Go with the battery. (and charger). Your volt meter is blowing fuses because you have the leads inserted in the current inputs and are trying to measure voltage.
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D

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